Flour-sifter



E. GASE. FLOUR SIFTER.

APPLlCATlON FILED OCT-25. 1920.

1,379,550. e t ay 24, 1921.

1N VENIDR T creme.

EU'GENE GASE, OF SAGINAW, MICHIGAN, ASSIGNOR TO BAKE R- PERKIN S MANUFAC- T'URIN G CORPORATION, OF SAGINAW, IJICHIGAN.

FLOUR-SIFTER.

Specification of Letters Patent.

Patented May 2 1, 1921.

Application filed Getober 25, 1920. Serial No. 419,497.

I I To all whom it may concern Be it known that I, EUGENE GAsE, a citizen of the United States, residing at Saginaw, in the county of Saginaw and State of Michigan, have invented new and useful Improvements in F lour-Sifters, of which the following is a specification;

'My invention relates to improvements in rotary sifters intended to separate line flour and. like pulverized substances from coarser particles and extraneous matters,

and has for its object to facilitate and accelerate this operation and to make it more eflicient and economical in every Way.

To this end I construct thesifting reel as a truncatedpreferably hexagonalpyramid the sides of which consist of exchangeable sieves removably fixed to the rim of spider wheels rigidly mounted on a rotary shaft arranged 'coaxially to the pyramid, the material to be sifted entering at the smaller end, and the waste residue leaving atthe larger end of the reel. 1

The novel features, arrangements, parts and combinations thereof which constitute my invention, are shown in the accompanying drawings'representing byway of example a reel intended for sifting in baking establishments large quantities of flour in as short a time as possible, and are fully ex plained in the following description.

The pyramidal reel shown is hexagonal,

and its sides are carried by three spider Wheels, one at each end and one in its middle part.

Figure 1 is a longitudinal'sectionof the whole sifting machine, and Fig. 2 is a transverse section taken on line 2-2 of Fig. 1; Fig. 3,"Fig. 4, and Fig. 5 show side views of the three spider wheels carrying the various sieves, and Fig. 6 represents an enlarged sectional view of the connection of the sieves to the middle spider wheel.

The i reference numeral 1 indicates the reel, 2 the rotary shaft, 3 the housing in which the operation takes place, 4 the inlet for the flour to be sifted, 5 the outlet for thesifted material and 6 the chamber in which the residue, which. did not pass through the sieves, collects. The reel 1 consists of-six smaller sieves '7 and six larger sieves 8,'on'e smaller sieve and one larger one forming together one side of the truncated'pyramid. -Th'e shorter ends of the sievesil are carried by the spider wheel 9,

the larger ends of the sieves 7 and the shorter ends of the sieves 8 b the s ider wheel 10, andthe larger endsh f the s ieves 8 by the splder wheel 11. The single-sieves consist of angle iron frames to which the slftlng cloth 12, usually brass gauze, is soldered or f xed in any other suitable wav; The angle lrons 13 and 1 1 at the ends of the sieves 7 and the angle irons 15 and 16 at the ends of the sieves 8 are rectangular, while the angle irons attheir slanting sides. 17 at the sieves 7 andlS at the sieves 8, are obtuse to such a degree, that, when the s eves are attached to the spiders, the upr ght parts of such angle irons placed along side each other are in touch throughout the r whole length and width, and that those parts, to which the sifting cloth'12 is attached forming an even plane therew1th, constitute the corners of the pyramid, as shown in Fig.2. The spider wheel 9, the smallest one, is hexagonal in circumference and curved in its middle part, the stralght rim having the same inclination to the horlzontal as the upright parts of the angle irons 13, when their sieves 7 are in position for forming the anterior part of the reel 1; at'thelower part of the rim bracketlike projections 19 form a hexagon the-sides of which are equal in length to the angle iron 13 and serve to support the shorter ends of the sieves 7, which are kept in position by means of the studs 20, fixed in the rim'of the wheel 19 and fitting in corresponding holes arranged in the uprights of the angle irons 13. The convex middle part of the wheel 9 is provided with four suitably curved arms 21 ending in the hub 22 fixed to the shaft 2 by means of the screw 23, and with the circular opening 2 1 corresponding to the circular tube 25 of the inlet 4. When in its proper position on the shaft 2, the concave part of the wheel 9 points inside the reel 1, and the circular opening 24, the edge of which may be broadened out, surrounds the tube 25 in such a manner that, while not impeding in any way the free circulation of the wheel 9, it yet prevents particles of the unsifted flour fed into the reel 1 through the tube 25 from escaping therefrom into the housing 3.

The spider wheel 10, the middle one in .position and size, is also hexagonal and has six straight spokes 26 ending in the hub 27 rigidly attached to the shaft 2 by means of order to prevent any possible'sidewise movements of the sieves 7 and8, studs provided in these brackets 'jare'pa'ssed through correfspending holes arranged 1n the sieve frames;

the studs 31 on the brackets'29 correspond to holes in the flat sides of'the angle irons 14, and the studs 32 in the brackets to holes in the angle irons 15. The edge of the rim of the wheel 10 is arranged to be lowerthan the topsof the angle irons 1 1 and 15, when their sieves 7 and 8 are in the proper p0 sition onthe brackets 29 and 30 respectively, and is provided with screw studs 33; the clamps 3 1' are placed over these studs 33 through corresponding openings therein and pressed downby means of the thumb screw nuts 35, the pressure being greferably controlled by the springs 36. ee Fig, 6'.) In thisway the sieves 7 and 8 are fastened and locked'unto the wheel 10, forming the main- 7 stay ofthe reel.

v The spider wheel 11 has six straight spokes 37 ending the hub 38 fixed to the shaft 2 by means ofthe' screw bolt 39, and is circular in circumference which corresponds to the openingin the partition wall 4:1 between the waste chamber 6 and the main part of the housing 3 containing the hopper 12, in which the fine flour sifted through reel lcollects; the rim of the wheel 11, and the opening 40 may be provided with broadened edges and are so arranged that, while the wheel 11 freely rotates therein, line sifted flour is prevented from entering into the chamber 6, and waste flour and 'impurities from penetrating from the latter into the main part of the housing 3. The

' rim of the wheel '11 is provided-like that of thertwo other wheels with brackets 43 arranged to form a hexagon, each side of which is equal inlength to the angleirons 16, which rest thereon andare kept in po- "sition by the studs a l, fixed in the rim of the wheel 11 and passing through'corresponding openings in the angle irons 16. For assembling the reel, the spider wheels 9,10and 11 are fixed to the shaft 2 so that vthe hexagonal brackets 19, 29, 30 and 43 are perfectly in line,and that the distance between the wheels 9 and 10 conforms to the length of the sieves 7, and [that shetween 10 and 11 to the length of the sieves 8. A single sieve 7 is then placed on a bracket 19, pushed against the rim of the wheel 9over the studs 20 and then let down on the corresponding b racket 29 'of the wheel 10over the studs 31; a sieve 8 forming together with the sieve 7, just put in position, one side of the reel 1 is arranged in the same manner on the brackets 30'o'f wheel 10 and 43 of wheel 11 and held there- 011 by the studs 32 and 14: respectively; the clamps 3d are then screwed down on the angle irons 14 and 15'; after every corre-.

sponding pairof the sieves 7 and 8 has been fixed inthe same manner, the reel 1, is complete and ready for work. After simply unscrewing thumb nuts 35 the sieves 7 c and 8 can be'lifted from" their seats and replacednby'other ones, the sifting cjloth of which has a different number ofop'enings Der square inch." f I i The shaft 2 is supportedby the bearings 45, arrangedat the front part of the'feeding' tube 25, and tdfixedto the outer wall of the chamber 6, and rotatediby means of r the 'Cl1iVlIlg wheel 47'. For rendering the flow of the flour to be sifted'in the reel 1 regula-nthe'feeding tube is provided with thesho'rt screw conveyer 48 fixed to the shaft 2. The half cir'cularchannel like bottom of the hoppercontainsithe screwconveyer 49 for movingthe fine floursifte'cl through reel 1 to the outlet 5; the power for driving the conveyer is transmitted from the shaft 2 by sprocket wheels and chain in the ordinary manner.

Iclaimp 7 v 1'. In a rotary flour sifter, in combination with removable sieves consisting of sifting cloth fixed to iron frames shaped to form a reel of truncated-pyramidalshape, of a driving shaft coaxial to the said reel, or three spider wheels-fixed to the'said shaft, oneifor each end and one for the iniddle portion"of the said reel, of hexagonal brackets provided at the rims of the sa d'spiderl wheels'and so constructed and arranged as to 'support the said sieves for forming the said reel, of means provided in theTim 0f the said two end spider wheels for keeping theouter ends of the said sieves, when pushed against the same, in position on the said brackets,'and of meansmounted on the rim of the said'middle spider wheel for locking the said sieves securely [in their position on the said brackets.

2. Ina rotary flour sifter', in combination with removable sieves consisting of sifting cloth fixed to angle-iron frames shaped-to form a reel of truncated-pyramidal shape,

of a drivingshaft coaxial to'the'saidreel, of three spider wheels fixed 'to-the'said shaft, one for each end and'one-for the middle portion of the said reel,'{'of si ngle hexagonal brackets providediat therims of the said end spider jwheelsfor supporting the outer ends of the said sieves soasto form the ends of thesaid reel,fof studsfixed above the said brackets sidewise i-nthe rims of the said end spider wheels, and-corresponding 1 holes provided inthe uprights forming the outer ends of the angle-iron frames of the said sieves, the said studs and the said holes keeping the latter in position on the said brackets, of twohexagonal brackets provided one at each side of the said middle spider wheel for supporting the inner ends of the said sieves so as thus to complete the said reel, of screw studs radially mounted on the rim of the said middle spider wheel, of clamps provided with openings for the said screw studs freely to pass through, and of thumb screw nuts meshing with the latter, the said screw studs, clamps and nuts being so constructed and arranged, that, when the said nuts are turned on the said studs against the said clamps, the latter press and fasten the inner ends of the said sieves onto the corresponding brackets of the said middle spider wheel, thus locking all the said sieves in their proper position to form the said reel.

EUGENE GASE. 

